Answer:
The major difference between tortoises and turtles is that tortoises dwell on land, while turtles live in the water some or nearly all of the time. (from Paragraph 3)
Explanation:
This is the sentence that seems out of place in the text. In this text, the author talks about the challenges of caring for turtles as pets. Moreover, he talks about red-eared turtles in particular. The fact that these can carry diseases, that they live all over the United States, and that they require a lot of attention are all relevant facts. However, the reader does not need to know the difference between turtles and tortoises.